The “Russians” that took Prague were dressed in German Army uniforms and were remnants of Vasloff’s Army who chased the SS units left to secure Prague out. They then surrendered Prague to a Czech delegation. Who once surrounded by the Stalinist forces allowed them to take the Vasloff group as prisoners and most if not all wound up being executed as traitors. Most of them were probably Ukrainians that fought with the Germans against the Russians .
Thanks, I have no background on any of that.